Engine valve



6; P. ABORN.

ENGINE VALVE.

MPLICATION men out. 21. I920.

Patentedsept. 1922. v

2 SHEETSSHEET G. -P. ABORN.

ENGINE VALVE. APPLICATION FILED OCT 27, i920.

1,427,767. I P t tedsept. 5,1922,

2 SHEETS-SHEET 2.

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Patented Sept. 5, 1922.

UNITED S'FA-TESJPATENT L'OFF'I'QE.

ii GEORGE P. .AIBORN, OF BROOKLINE, MASSACHUSETTS, ASSIGNOR TO WORTHINGTON PUMP AND MACHINERY CORPORATION, A- CORPORATION OF VIRGINIA.

ENGINE Application filed October 2'? Be it known-that I, GEORGEP. ABoRN,

in the auxiliary valve seat 19, connect'respectively with longitudinal:passages 3, 4: ex-

acitizen of the United States, residing atmtending through -theauxiliary. piston 17 to opposite ends thereof forspassage of steam Brookline, county of Norfolk, and State of Massachusetts, have invented certain new and useful Improvements in Engine Valves, fully described and represented in the fol lowing specification and the accompanying drawings, forming a part of the same.

This invention relates to steam engines equipped with fluid actuated valves espeeially adapted for use in direct acting pumps, andparticul arly to a fluid actuated valve structure in which the main slide valve is moved by an auxiliary piston while" free therefrom for movement toward and away fromdts seat andthe auxiliary ex' haust passes thro'ugh the auxiliary piston and main valve to the exhaust cavity therein for-discharge with the main cylinder ex-' haust.

The object of this invention is to provide a cheap,"e'lticient and durable valve mechanisinl of this type which shall not require packing to prevent leakage of live steam to the auxiliaryexhaust passage.

In the drawings, which show two valve mechanisms embodying the preferred forms of the inventioni Fig. 1 is a section transversely of the steam cylinder showing one form of the invention;

Fig. 2 is a section on line 2-2 of Fig. 1;

Fig. 3 is a section longitudinally of the steam cylinder showinganotherform of the invention; and

'Fig. 1 is a top plan view of the main slide valve shown in Fig. 3.

Referring to the drawings, the main en-- gine cylinder A, within which'operates the piston 10, is provided with a seatll for the auxiliary cylinder 13 having a central valve seat 12supplied with the usual steam ports and passages 13, 14 for delivery of steam to and from the opposite ends of the cylinder A, and an exhaust port and passage 15 conmeeting with the side exhaust outlet 16.

The auxiliary piston 17 comprises preferably two pistons cast integrally with a connecting portion 18 and is provided with a valve seat 19 for the auxiliary valve 20 which is actuated by rod 21 through suitable links and levers connected to the piston rod of the main piston 10. Suitable ports 1, 2

to and-from -the ends of the-auxiliary cylinder B and are connected'with exhaust "port and-passage 5 through exhaust cavity 6 in the auxiliary valve 20.

The-mainvalve 22, which is of theicommon' E)- type, is provided with one or more projections which engage the central part of the aux iliary:.-piston 17 so that the valve is movediby the piston while free therefrom spared projections 2a, 25receiving between them the connecting portion 18 0f the auxiliary piston 17, which is preferablyflrectangular throughout thatportionbetween the projections, and is provided on each side with a pair of'spaced flanges 26adapted to move the main valve 22 as a unit with the auxiliary piston 17 and to allow vertical movement of the main. valve. Auxiliary exhaust port and passage 5 connect with a horizontal port 9 on one side of the connecting portion 18 which registers with va-port 7 on the inner side of the projection 25 connected to the main slide valve exhaust cavity by a passage 8. To prevent vertical movement ofthe main valve:22' from decreasing the size cf the auxiliary. exhaust passage below-its normal capacity I preferably provide the ports?) and 7 with flaring openings, as shown.

Suitable means is provided to assure steam tight engagement of the projection 25 and the corresponding side of the auxiliary piston which may be of the form shown, in which spring 27 is placed between the projection 24 and the corresponding side of the auxiliary piston and is held in position by a screw 28 secured in the projection 24.

The operation is as follows; main valve 22 is moved across the valve seat 11 by auxhaust.

In the modification shown in Figs. 3 and 4 the main valve 22 is provided with a single elongated projection 29 which fits within a suitable recess 30 in the connecting portion 18 of the auxiliary piston 17 Projection 29 is provided on one side with a porta registering with a port b in the corresponding side wall of recess 30, the port 1) connecting with the auxiliary exhaust port and passage 5 and the port a connecting with the exhaust cavity 23 of the main valve through a pas As in the first construction the sage 0.

provided with flaring ports a and b are openings and are held in steam tight engagement by spring 31 hearing against projection 29 and the side wall of the recess 30,

1 and secured to the main valve by screw 32.

' What is claimed is:

1. In a steam engine valve, the combina tionwith a main valve, an auxlllary piston for moving the main valve, an auxiliary valve controlling the movement of the auxiliary piston, and an auxiliary exhaust passage through the auxiliary piston, of a side port in the auxiliary piston connecting with the auxiliary exhaust passage, a projection on the main valve, a side port in the projection registering with the first mentioned port and connected to the main valve exhaust cavity, and means for holding the ports in steam tight engagement.

2. In a steam engine valve, the combination with a main valve, an auxiliary piston for moving the main valve, an auxiliary valve controlling the movement of the auxiliary piston, and an auxiliary exhaust passage through the auxiliary piston, of a side port in the auxiliary piston connecting with the auxiliary exhaust passage, a projection on the main valve, a side port in the proection reglstering with the first mentioned port and connected to the main valve exhaust cavity, and resilient means for holding the ports in steam tight engagement.

3. In a steam engine valve, the combination with a main valve, an auxiliary piston for moving the main valve, an auxiliary valve controlling the movement of the aux iliary piston, and an auxiliary exhaust passage through the auxiliary piston, of a side port in. the auxiliary piston connecting with the auxiliary exhaust passage, a projection on the main valve, a side port in the projection registering with the first mentioned port and connected to the main valve exhaust cavity, resilient means for holding the ports in steam tight engagement, and flaring openings for the ports.

4. In a steam engine valve, the combination with a main valve, an auxiliary piston for moving the main valve, an auxiliary valve controlling the movement of the auxiliary piston, and an auxiliary exhaust passage through the auxiliary piston, of a side port in one side of the auxiliary piston and connected to the auxiliary exhaust passage, projections on the main valve adapted to re ceive the auxiliary piston between them, a side port in one projection registering with the first mentioned port and connected to the main valve exhaust cavity, and resilient means between the other projection and the auxiliary piston for holding the ports in steam tight engagement.

- 5. In a steam engine valve, the combination with a main valve, an auxiliary piston for moving the main valve, an auxiliary Valve controlling the movement of the auxiliary piston, and an auxiliary exhaust passage through the auxiliary piston, of a port in one side of the auxiliary piston and connected to the auxiliary exhaust passage, projections on the main valve adapted to receive the auxiliary piston between them, a side port in one projection registering with the first mentioned port and connected to the main valve exhaust cavity, resilient means between the other projection and the auxiliary piston for holding the ports in steam tight engagement. and flaring openings for the ports.

In testimony whereof, I have hereunto set my hand.

GEORGE P. ABORN. 

